/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <assert.h>

#include "uv.h"
#include "internal.h"
#include "handle-inl.h"

void uv_loop_watcher_endgame(uv_loop_t* loop, uv_handle_t* handle)
{
    if (handle->flags & UV__HANDLE_CLOSING) {
        assert(!(handle->flags & UV_HANDLE_CLOSED));
        handle->flags |= UV_HANDLE_CLOSED;
        uv__handle_close(handle);
    }
}

#define UV_LOOP_WATCHER_DEFINE(name, NAME)                          \
    int uv_##name##_init(uv_loop_t* loop, uv_##name##_t* handle)    \
    {                                                               \
        uv__handle_init(loop, (uv_handle_t*)handle, UV_##NAME);     \
                                                                    \
        return 0;                                                   \
    }                                                               \
                                                                    \
    int uv_##name##_start(uv_##name##_t* handle, uv_##name##_cb cb) \
    {                                                               \
        uv_loop_t* loop = handle->loop;                             \
        uv_##name##_t* old_head;                                    \
                                                                    \
        assert(handle->type == UV_##NAME);                          \
                                                                    \
        if (uv__is_active(handle))                                  \
            return 0;                                               \
                                                                    \
        if (cb == NULL)                                             \
            return UV_EINVAL;                                       \
                                                                    \
        old_head = loop->name##_handles;                            \
                                                                    \
        handle->name##_next = old_head;                             \
        handle->name##_prev = NULL;                                 \
                                                                    \
        if (old_head) {                                             \
            old_head->name##_prev = handle;                         \
        }                                                           \
                                                                    \
        loop->name##_handles = handle;                              \
                                                                    \
        handle->name##_cb = cb;                                     \
        uv__handle_start(handle);                                   \
                                                                    \
        return 0;                                                   \
    }                                                               \
                                                                    \
    int uv_##name##_stop(uv_##name##_t* handle)                     \
    {                                                               \
        uv_loop_t* loop = handle->loop;                             \
                                                                    \
        assert(handle->type == UV_##NAME);                          \
                                                                    \
        if (!uv__is_active(handle))                                 \
            return 0;                                               \
                                                                    \
        /* Update loop head if needed */                            \
        if (loop->name##_handles == handle) {                       \
            loop->name##_handles = handle->name##_next;             \
        }                                                           \
                                                                    \
        /* Update the iterator-next pointer of needed */            \
        if (loop->next_##name##_handle == handle) {                 \
            loop->next_##name##_handle = handle->name##_next;       \
        }                                                           \
                                                                    \
        if (handle->name##_prev) {                                  \
            handle->name##_prev->name##_next = handle->name##_next; \
        }                                                           \
        if (handle->name##_next) {                                  \
            handle->name##_next->name##_prev = handle->name##_prev; \
        }                                                           \
                                                                    \
        uv__handle_stop(handle);                                    \
                                                                    \
        return 0;                                                   \
    }                                                               \
                                                                    \
    void uv_##name##_invoke(uv_loop_t* loop)                        \
    {                                                               \
        uv_##name##_t* handle;                                      \
                                                                    \
        (loop)->next_##name##_handle = (loop)->name##_handles;      \
                                                                    \
        while ((loop)->next_##name##_handle != NULL) {              \
            handle = (loop)->next_##name##_handle;                  \
            (loop)->next_##name##_handle = handle->name##_next;     \
                                                                    \
            handle->name##_cb(handle);                              \
        }                                                           \
    }

UV_LOOP_WATCHER_DEFINE(prepare, PREPARE)
UV_LOOP_WATCHER_DEFINE(check, CHECK)
UV_LOOP_WATCHER_DEFINE(idle, IDLE)
